I originally thought that she was Arrowette, changed for the show but someone told me that she will appear later there so I guess she is an original character.

You probably shouldn't be goggling people.
 
They should have used Arrowette instead, I don't know who this is.

" I originally thought that she was Arrowette, changed for the show but someone told me that she will appear later there so I guess she is an original character. "

The cast itself looks like a mash-up of the original Teen Titans and Young Justice members from various eras:

Robin: Voiced by Jesse McCarthy. In this series, he’s a 13 year old Dick Grayson, but he’s been Robin for a few years time.

Kid Flash: Voiced by Jason Spizak.He’s Wally West and he’s 15 years old. Not quite as fast as the Flash.

Aqualad: Voiced by Khary Payton (who also provided the voice for Cyborg). He’s not Garth, but Garth will be appearing on the show, we’re assured (no word on whether Garth would be Aqualad or Tempest). And confirmed on the panel: This new Aqualad’s father is Black Manta.

Superboy: Voiced by Nolan North. Superboy is close to the comic book version. He’s a 16-week old clone, and he’ll eventually assume the Conner Kent secret identity.

Miss Martian: Voiced by Danica McKellar.Martian Manhunter’s 16-year old niece.

Artemis: Voiced by Stephanie Lemelin. This 16-year old heroine is neither Arrowette, nor Wonder Girl nor Speedy. But she is an existing character in the DCU! The panel refused to reveal who, however.

Speedy: Not part of the team, but Speedy (the Roy Harper version) was seen in the trailer.
 
my Young Justice blog

" @GreenLantern555: I don't know her. Do you have any scan? "

" @JCJQLB: @ComicMan24: @danhimself: @Sexy Merc:  Isn't she the girl that was babysitting Lian when Star City Exploded? Because she was in an Archer costume later on in the Rise and Fall mini-series. Didn't catch her name though... "

" @GreenLantern555 said:

" @JCJQLB: @ComicMan24: @danhimself: @Sexy Merc:  Isn't she the girl that was babysitting Lian when Star City Exploded? Because she was in an Archer costume later on in the Rise and Fall mini-series. Didn't catch her name though... "

no....that's Speedy....they've already said that it's not her "

" @GreenLantern555:@danhimself: So who is her? Maybe Moonbow? Or Arrowette's mother? "

" @danhimself: Maybe but she's not an archer! "

" @JCJQLB said:

" @danhimself: Maybe but she's not an archer! "

hence the grasping at straws...it doesn't make sense but I'm just looking at teenage blond characters "

" isnt she just the Artemis from Wonder Woman? "

" @JCJQLB: Stargirl's powers come from her equipment. So she could be her. "

  Off-shoot question:  Is this character going to appear in the new Green Arrow series?  The new Aqua-Lad has his appearance in Brightest Day, so Artemis would probably be a part of Ollies' Merry Men.

" @WW-Fan said:

" isnt she just the Artemis from Wonder Woman? "

No it's a different character.  "

She's A Character Created For The TV Series Based On Arrowette.

" @ComicMan24 said:

" @WW-Fan said:

" isnt she just the Artemis from Wonder Woman? "

No it's a different character.  "

it looks like her a little bit :) "

" @danhimself said:

" @JCJQLB said:

" @danhimself: Maybe but she's not an archer! "

hence the grasping at straws...it doesn't make sense but I'm just looking at teenage blond characters "

So they are gonna use a random character from the comics? They could make her an original character at least. "

" She's A Character Created For The TV Series Based On Arrowette. "

" @WW-Fan said:

" @ComicMan24 said:

" @WW-Fan said:

" isnt she just the Artemis from Wonder Woman? "

No it's a different character.  "

it looks like her a little bit :) "

I don't see the resemblance. They don't even have the same hair colour, Artemis from the Amazons is a redhead and Artemis from the show is blond. "

"@WW-Fan:  No Wonder Girl. "

" @WW-Fan:  That won't be happening for... a very long time.  Some kind of law suit or something about the Wonder Woman family appearing in series.  Okay, not a lawsuit... but it's something big that I've forgotten that prevents them from appearing a lot of the time. "